Smog Cough, Asthma or Chest Infection? Signs That Need a Doctor
By the second week of November half of Lahore is coughing. Most of it is plain smog cough, an irritated throat and airways that settle when the air clears. But the same week hides asthma flares, chest infections and, surprisingly often, acid reflux dressed up as a breathing problem. Here is how to tell them apart at home, what to swap for the smog months, and the breathing signs that mean you stop guessing.
At a glance
- Smog cough: dry, tickly, worse outdoors, no fever, eases indoors with clean air
- Asthma flare: wheeze, tight chest, night cough, reliever needed more often
- Chest infection: fever, coloured phlegm, feeling unwell, faster breathing
- Reflux: cough after meals or lying down, sour taste, hoarse mornings
- Urgent: breathless at rest, can’t finish a sentence, blue lips, oxygen reading 92% or below
Prefer to listen? This post as a 5 min video
What a smog cough feels like
Fine particles and gases in smog irritate the lining from nose to lungs. The result is a dry, scratchy, tickly cough, often with stinging eyes, a runny nose and a sore throat, all worse after time outdoors or on a motorbike, and all better after a few hours in a room with the windows shut and a purifier running. No fever. Appetite normal. You feel annoyed, not ill.
That pattern matters more than any single symptom. Irritation tracks the air. Infection tracks its own course.
Our earlier piece on smog, skin, eyes and indoor air covers the non-chest side; this one is about the cough.
Smog cough, asthma or chest infection: side by side
| Sign | Smog irritation | Asthma flare | Chest infection |
|---|---|---|---|
| Fever | No | Usually no | Often, 38 °C or more |
| Phlegm | Little, clear | Clear or white | Yellow, green or rusty |
| Wheeze, tight chest | Mild at most | Yes, often at night | Sometimes |
| Better indoors? | Yes, within hours | Partly | No |
| Feeling ill | No | Tired from poor sleep | Yes, achy and weak |
Real life blurs these. Smog can set off asthma, and an asthma flare can turn into an infection. If you’re unsure, the breathing signs in the caution box decide it.
Acidity and breathing problem: when reflux is the cough
Stomach acid that rises into the food pipe, especially lying down after a late, heavy dinner, can drift up to the throat and irritate the voice box and airways. People describe it as “acidity and breathing problem”: a cough after meals, a sour or bitter taste, burning behind the breastbone, clearing the throat all morning, a hoarse voice. Smog season, with its heavy winter food and late nights, makes it more common.
Simple checks help. Does the cough come within an hour of eating, or when you lie flat? Is it better on days you eat early and light? Those point to reflux. Raising the head end of the bed by 10 to 15 cm (bricks under the legs, not extra pillows) and eating dinner 3 hours before sleep often settle it. Our guide to acidity and heartburn has the rest.
One warning, stated plainly. Chest discomfort with breathlessness, sweating, or pain spreading to the arm, jaw or back is not acidity until a doctor says so. In older adults and people with diabetes a heart attack often feels like “gas”. Go to emergency.
If you use an inhaler
Smog weeks are when asthma and COPD plans get tested. The biggest wins are small and practical.
- Keep taking your preventer (usually the brown, orange or purple inhaler) every day exactly as prescribed, even when you feel fine. Never stop or change it on your own.
- Carry your reliever (usually blue) everywhere. Check the counter or expiry.
- Use a spacer with a metered inhaler; it gets far more medicine into the lungs. Shake, one puff into the spacer, then 4 to 5 slow breaths through it.
- Rinse your mouth and spit after a steroid preventer.
- Note how often you use the reliever. Needing it more than usual, or more than twice a week, means see your doctor this week for a review.
- Ask for a written asthma action plan if you don’t have one, so you know what to do in a flare.
For the longer view, see our honest asthma home care guide.
Smog-week swaps for your chest
- Cloth or surgical mask → a fitted N95 or KN95 outdoors. Pinch the metal strip over the nose; if your glasses fog, it isn’t sealed. Not for children under 2.
- Morning walk → indoor movement when the air quality index is above 150; above 200, everyone stays in. Our indoor activity plan for smog weeks keeps you moving.
- Angithi or gas heater in a closed room → an electric heater and a window cracked open. Indoor smoke and fumes add to the load; see indoor air pollution at home.
- Mosquito coils and agarbatti → nets and plug-ins for the smog months.
- Cough syrup from the chemist → warm fluids, salt-water gargles (half a teaspoon of salt in a glass of warm water) and honey for anyone over 1.
More seasonal swaps live in Season Shift. Older parents get a separate guide to quiet pneumonia signs.
Go to emergency now for breathlessness at rest, being unable to finish a sentence, lips or fingertips turning blue or grey, the chest sucking in between the ribs, confusion or drowsiness, coughing up blood, chest pain, or a pulse oximeter reading of 92% or below at rest (unless your doctor has given you a different target for COPD). See a doctor today for a reading of 93 to 94%, fever of 39 °C or above, fever beyond 3 days, reliever inhaler not lasting 4 hours, or wheeze for the first time in your life. See a doctor this week for a cough beyond 3 weeks, weight loss, night sweats or a hoarse voice beyond 3 weeks. Children: fast breathing, chest indrawing or any fever under 3 months need a doctor today, and no over-the-counter cough medicine under 6.
Smog cough: your questions
How do I know if my cough is from smog?
A smog cough is dry and tickly, has no fever, gets worse outdoors and eases within hours indoors with clean air. If you feel genuinely unwell, have a fever or coloured phlegm, think infection.
How long does a smog cough last?
Usually as long as the bad air, plus a few days. A cough beyond 3 weeks needs a doctor whatever you think the cause is.
Can acidity cause breathing problems?
Yes. Acid reflux can irritate the throat and airways, causing cough, throat clearing, hoarseness and sometimes wheeze, especially after meals or lying down. Chest pain with breathlessness must be checked as possible heart trouble first.
Can smog trigger asthma?
Yes. Smog is a common trigger for asthma flares. Keep taking your preventer daily and carry your reliever.
Which mask is best for smog?
A well-fitted N95 or KN95. Cloth and surgical masks don’t filter fine smog particles well. It must seal around the nose and chin.
What oxygen level is dangerous?
For most people, 92% or below at rest is an emergency and 93 to 94% needs a doctor the same day. People with COPD may have a different target set by their doctor.
Should I take antibiotics for smog cough?
No. Antibiotics do nothing for irritation or viruses. They’re only for bacterial infections a doctor has diagnosed.
Is steam inhalation good for smog cough?
A steamy bathroom can soothe a dry throat. Bowls of boiling water cause scalds, especially with children around, so take care.
Can I go for a walk during smog?
When the air quality index is above 150, move exercise indoors. Above 200, everyone should stay in, and people with heart or lung disease should limit time outside even sooner.
What helps a smog cough at home?
Clean indoor air, warm fluids, salt-water gargles, honey for anyone over 1, and keeping windows shut on bad days. A purifier in the bedroom helps most.
When is a cough in a child serious?
Fast breathing, the chest sucking in, grunting, blue lips, fever of 39 °C or more, fever beyond 3 days, or any fever under 3 months. Our guide to counting fast breathing in children explains how to check.